Not sure which ring you're looking at but it isn't this one ! The ring does not show the first initial, and nor should it. It reads 'Slb Giebel 20.4.37 H Himmler'.
The only confusion earlier arose from the surname spelling, whether it was 'Siebel' as the previous vendor thought, or 'Giebel', and after research we are agreed it reads 'Giebel'. The deduction that this belonged to a Wilhelm Giebel was reached after searching the various DALs and establishing that Wilhelm Giebel had received an honor ring at this time
